I used the lantern pinion drilling rig to make the pinion, so today there are more photos of that. It is mounted to the old Moseley watchmakers' lathe. There is a 1" square aluminum block mounted on the lathe compound. This contains two 3/16" (inside diameter) ball bearings (router guide bearings, actually) through which are inserted various tools. There are photos of a centering tool, a countersink center, and various drills, all of which are interference fit into 3/16" brass. The tools are threaded on one end, where a nut is threaded when in use. The other end is driven from the lathe compound with a small wooden pulley, which is held onto the brass rod of the tool with a finger nut. This rig makes very good pinions.
Because the shrouds of the pinion must be pressed rather a long distance on this arbor, I used a small arbor press to press the shroud down on the arbor. The steady pressure is less apt to bend the thin arbor than repeated hammer raps.
After the center arbor was constructed, it was meshed together with the contrate arbor (which it drives) in the Webster depthing tool. The meshing of the gears is adjusted properly with the wheels mounted in the tool, then the sharp points on the depthing tool are used make marks the proper distance apart on the frame of the clock. The pivot holes are drilled with the plates pinned together, as described in an earlier installment. The front hole is redrilled to 3/32" for the long end of the center arbor to go through, then reamed to size with a clockmaker's broach.
Today's links:
Drilling rig.
Drilling rig tools.
Lathe setup.
Pressing with arbor press.
Center arbor done.
Arbors in depthing tool.
Marking plates with depth tool.
Wheels in place